The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
Widely recorded from west Cornwall to east Kent and north to Berkshire, Bedfordshire and Norfolk. It is cleptoparasitic species whose main host is the bee Mellita leporina and to a lesser extent Mellita tricincta , both of which are rare in Cornwall. Whereas they are numerous pre-1930 Cornish records, there are only two post-1980 records; coast between Tintagel Head and Boscastle (G.M.Spooner) and much more recently (2003) from Predannack on the Lizard Peninsula.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.